Data model
REST interface
GUI element to watch a live stream
GUI element to see the upcoming live streams
GUI element to edit live stream events

Implement an export as PDF of the member list in group and course
element. Extend the PDF service to support rendering of a cloned
controller.

Use the status of the course where the resources is linked to block the
notifications. Reverse the check if the notifications are allowed
between preview and life course environment

Move the functions of OlatRootFile and OlatRootFolder to the Local
implementations to simplify the use of VFS, implements factory methods
in VFSManager, reduce the number of call to meta informations in folder
listing

Fix deletion of metadata, fix left files by restore of versioned files,
implement restore of metadata of deleted versioned files, implements an
upgrader to delete metadata of deleted resources, courses, groups,
forums, users and temporary uploaded files

Differentiate managed and user created event in the personal calendar,
reactivate the icons for this in themes after upgrade of fullcalendar
library, better placement of the help in the calendars configuration

For the add operation, the start and end date is passed as ISO 8601
dates to prevent issues with timezone and daylight savings